A step up transformer operates on a 230 volt line and supplies to a load of 2 amp. The ratio of primary to secondary windings is 1 : 25. Determine the primary current

12.5 amp

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50 amp

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8.8 amp

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25 amp

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Solution

The correct option is A 50 amp
Secondary current is 2 amp, and the ratio of primary to secondary windings is $1 : 25$ ,
so the current in the primary must be $2 X 25 = 50 a m p$ .
Current is inversely proportional to the ratio of primary to secondary windings.

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